i was kinda curious, i only know spots but even those spots are kinda dubious, carnera baer bradock louis charles walcott marciano patterson johanson petterson liston clay (ali) frazier foreman ali spinks ali holmes spinks tyson douglas holyfield bowe holyfield bowe vacant ? moorer ? foreman? briggs ? vacant ? holyfield ? lewis ?
Peter Jackson claims the title first (May 30 1892) beating Frank Slavin in 10 t0 win the Police Gazzette Championship belt he loses to James J Jeffries Jeffries retires undefeated on May 13 1905 Marvin Hart beats Jack Root in 12 on July 3rd 1905 to claim the Championship Hart loses to Tommy Burns in 1906 Burns loses to Jack Johnson in 1908 Johnson beats a comebacking Jeffries in 1910 Jess Willard beats Jack Johnson in 1915 Jack Dempsey beats Jess Willard in 1919 Gene Tunney beats Dempsey in 1926 Tunney retired in 1928 Max Schmeling claims the title in 1930 with a 4 round dq win over Jack Sharkey 1932: Sharkey beats Schmeling in a rematch 1933: Primo Carnera beats Sharkey 1934: Max Baer beats Carnera 1935: James J Braddock beats Baer 1937: Joe Louis beats Braddock 1949: Louis retires for a short time, before a 1950 loss to Ezzard Charles 1951: Charles loses to Jesey Joe Walcott 1952: Walcott loses to Marciano
1956: Marciano retires; Floyd Patterson beats Archie Moore in five to win the vacant Championship 1959: Patterson loses to Ingemar Johansson 1960: Johansson loses to Patterson 1962: Patterson loses to Sonny Liston 1964: Liston loses to Cassius Clay, who changes his name to Muhammad Ali 1970: Muhammad Ali announces his retirement; Joe Frazier beats Jimmy Ellis to win the vacant Championship 1971: Frazier beats the comebacking Muhammad Ali 1973: George Foreman beats Frazier 1974: Ali beats Foreman 1978: Leon Spinks beats Muhammad Ali, and then loses the rematch 1979: Ali announces his retirement 1980: Ali comesback and loses to Larry Holmes 1985: Holmes loses to Michael Spinks 1988: Spinks loses to Mike Tyson 1990: Tyson loses to James Douglas, who loses to Evander Holyfield
1992: Holyfield loses to Riddick Bowe 1993: Bowe loses a Holyfield rematch 1994: Michael Moorer beats Holyfield, then loses to George Foreman 1997: Foreman loses to Shannon Briggs 1998: Briggs loses to Lennox Lewis 2001: Hasim Rahman beats Lewis and then loses the rematch 2004: Lewis announces his retirement